RE: [cobalt-users] Do I have to worry?

["Dan Kriwitsky" <webhosting@xxxxxxxxx>]

> Jun 15 20:26:18 www sendmail[4500]: f5FIOr904500: ruleset=check_mail,
> arg1=<firstmate@xxxxxxxxxxx>, relay=teleglobe.net [216.6.14.155] (may be
> forged), reject=451 4.1.8 <firstmate@xxxxxxxxxxx>... Domain of sender
> address firstmate@xxxxxxxxxxx does not resolve
>
> Is somebody trying to use my raq for spam or what? How can I stop these
> messages?
>

No, it means the sender's DNS may have had problems and your server thought
firstmate@xxxxxxxxxxx didn't exist. The RaQ will bounce mail from
nonexistent domain names. It does exist. Either your DNS couldn't find it,
or their DNS was down or unreachable at the time. Seeing as they're running
two nameservers on the same IP, it smacks of a problem domain. Whether it
was spam or not, you'll have to see the email.

SQL01.cccecom.com	A	203.46.224.197
sparky.mas.com.au	A	203.46.224.197

--- verify e-mail "firstmate@xxxxxxxxxxx"
--- looking up mailexchange for cccecom.com
--- found mailexchange "wiggles.mas.com.au"
--- contacting host wiggles.mas.com.au [203.46.224.196] on port 25


220 mail02.mas.com.au ESMTP Server (Microsoft Exchange Internet Mail Service
5.5.2653.13) ready
> HELO yahoo.com
250 OK
> VRFY firstmate@xxxxxxxxxxx
252 Cannot verify user
> MAIL FROM: <webhosting@xxxxxxxxx>
250 OK - mail from <webhosting@xxxxxxxxx>
> RCPT TO: <firstmate@xxxxxxxxxxx>
250 OK - Recipient <firstmate@xxxxxxxxxxx>
> EXPN firstmate@xxxxxxxxxxx
502 command not implemented

--- verify completed
--
Dan Kriwitsky